Construction of CoP/Co 2 P Coexisting Bifunctional Self-Supporting Electrocatalysts for High-Efficiency Oxygen Evolution and Hydrogen Evolution.

Autor: Zhang L; Key Laboratory of New Processing Technology for Nonferrous Metals and Materials, Ministry of Education, School of Resources, Environment and Materials, Guangxi Institute Fullerene Technology (GIFT), Guangxi University, Nanning 530004, China., Chen Y; College of Engineering, Department of Mathematics and Physical Sciences, University of Exeter, Exeter EX4 4QF, U.K., Liu G; Key Laboratory of New Processing Technology for Nonferrous Metals and Materials, Ministry of Education, School of Resources, Environment and Materials, Guangxi Institute Fullerene Technology (GIFT), Guangxi University, Nanning 530004, China., Li Z; Key Laboratory of New Processing Technology for Nonferrous Metals and Materials, Ministry of Education, School of Resources, Environment and Materials, Guangxi Institute Fullerene Technology (GIFT), Guangxi University, Nanning 530004, China., Liu S; Key Laboratory of New Processing Technology for Nonferrous Metals and Materials, Ministry of Education, School of Resources, Environment and Materials, Guangxi Institute Fullerene Technology (GIFT), Guangxi University, Nanning 530004, China., Tiwari SK; Key Laboratory of New Processing Technology for Nonferrous Metals and Materials, Ministry of Education, School of Resources, Environment and Materials, Guangxi Institute Fullerene Technology (GIFT), Guangxi University, Nanning 530004, China., Ola O; Advanced Materials Group, Faculty of Engineering, The University of Nottingham, Nottingham NG7 2RD, U.K., Pang B; Key Laboratory of New Processing Technology for Nonferrous Metals and Materials, Ministry of Education, School of Resources, Environment and Materials, Guangxi Institute Fullerene Technology (GIFT), Guangxi University, Nanning 530004, China., Wang N; Key Laboratory of New Processing Technology for Nonferrous Metals and Materials, Ministry of Education, School of Resources, Environment and Materials, Guangxi Institute Fullerene Technology (GIFT), Guangxi University, Nanning 530004, China., Zhu Y; Key Laboratory of New Processing Technology for Nonferrous Metals and Materials, Ministry of Education, School of Resources, Environment and Materials, Guangxi Institute Fullerene Technology (GIFT), Guangxi University, Nanning 530004, China.; College of Engineering, Department of Mathematics and Physical Sciences, University of Exeter, Exeter EX4 4QF, U.K.
Jazyk: angličtina
Zdroj: ACS omega [ACS Omega] 2022 Apr 04; Vol. 7 (15), pp. 12846-12855. Date of Electronic Publication: 2022 Apr 04 (Print Publication: 2022).
DOI: 10.1021/acsomega.2c00123
Abstrakt: Development of a low cost, high activity, and stable nonprecious metal bifunctional catalyst for electrocatalytic water cracking is a hot topic and big challenge. In this paper, we prepared a nitrogen-doped carbon nanotube (NCNT)-enhanced three-dimensional self-supported electrocatalyst with CoP and Co 2 P coexistence by a two-step strategy of high-temperature carbonization and low-temperature phosphorylation. Furthermore, the induced three-dimensional carbon network skeleton facilitates rapid charge transfer. In addition, the active sites of the carbon foam (CF) are greatly increased by the construction of hollow structures. As a bifunctional electrocatalyst, CoP/Co 2 P/NCNT@CF exhibited excellent catalytic activity for both hydrogen evolution reaction and oxygen evolution reaction in alkaline media, requiring low overpotentials of 133 and 289 mV to obtain a current density of 10 mA cm -2 , respectively. Additionally, the synthesized catalysts also exhibit good long-term stability, maintaining high catalytic activity after 20 h of continuous operation. We also confirmed the main driving force to improve the electron transfer between the heterostructures of Co and P by XPS spectra. The excellent electrocatalytic performance can be attributed to the close synergy between the highly active CoP/Co 2 P/NCNT and CF. This study provides a new strategy for the design of highly active bifunctional self-supporting electrocatalysts.
Competing Interests: The authors declare no competing financial interest.
(© 2022 The Authors. Published by American Chemical Society.)
Databáze: MEDLINE
Externí odkaz: